Pyrometer.



A. W. DIAGK.

PYBOMETEB.

11221101111011 FILED 1111.20. 1911.

1,000,673. Patented Aug. 15, 1911 Fig.3.

au-mmtoz ARCHIBALD W. DIACK, OF DETROIT, MICHIGAN.

PYROMETER.

Specification of Letters Patent.

Patented Aug. 15, 1911.

Application filed January 20, 1911. Serial No. 603,738.

To all whom it may concern;

Be it known that I, ARCHIBALD W. Draox,

. a citizen of the United States, and a resident of Detroit, in the county of Wayne and State of'Michigan, have invented a new and useful Pyrometer, of which the following is a specification.

This invention relates to means for determining whether the temperature of a certain article or chamber has been raised to a predetermined point, and its object is to provide a device which may be placed adjacent to or within rolls of bandages or other articles so that the fact that the articles have been heated sufficiently to completely sterilize them maybe established; which may be employed to determine the temperature of baths; and for such other I purposes as require the use of pyrometers.

In the accompanying drawings, Figure 1' is an elevation showing the pyrometer before being raised-to the critical temperature. Fig. 2 is a view of the same after it has been so heated. Fig. 3 is a view of a fusible body adapted to be used with thisdevice.

Similar reference characters refer to like parts throughout the several views.

Bandages and sponges for surgical uses should be raised to a temperature of 115 degrees C. and kept at that temperature for at least ten minutes in order to completely destroy all germs. If the temperature is raised beyond this point, less time will be required. There is always dan er that the heat will not penetrate to the middle of the roll of bandages or of a package of rolls. The device shown in the drawings may be made very small and be inserted where desired, preferably in the center of the roll of bandages or package of rolls or into holes in the sponges. It is preferably made of glass, or other suitable material, which is transparent and'which does not fuse at the temperature to which the article will be heated. The form is referably a cylindrical tube 1 having within it a small fusible body 2, also preferably a cylinder, the size being such that it can freely move within the tube 1. The ends of the tube are preferably hermetically sealed.

A black thread or other cmiiiector may be secured to the pyrometer and extend out through the wrapper of the-bandage .or

' package so that the pyrometer may be withdrawn in order to determine whether the package has been properly sterilized. The fusible substance may be phenacitin, acetanilid, sulfur or a fusible salt, gum or alloy, depending upon the temperature to which the articles to be sterilized are to be raised. When phenacit-in, acetanilid, sulfur or other substances are employed, they may be mixed with sugar or other proper materials to retard the fusing, and with any desired dye in order to make them more conspicuous when melted. The substances named are desirable for sterilizing as their fusing points are between about 110 and 115 degrees C. A further advantage possessed by these substances is that they become liquid when melted and smear up on the glass, thus rendering any possibility of error remote. Any other desired shape may be given .to the case and fusible substance, and theymay be of any desired size.

Having now explained my improved pyrometer, what I. claim as my invention and desire to secure by Letters Patent is 1. An improved pyrometer comprising a transparent shell and a fusible body therein whose definite known melting point is above 100 degrees centigrade.

2. A device for testing temperatures to which bandages have been raised, comprising a glass tube having its ends hermetically sealed, 2. small body of fusible material Within the tube which body remains solid at temperatures below 100 degrees centigrade, and fuses ata lower temperature than the-melting point of the glass tube, and

a flexible connector secured to the pyrom-' eter and adapted to extend outside of the bandage whereby the pyrometer may be removed. 7

3. An improved pyrometer, comprising a glass tube 1 having its ends hermetically sealed and a small body of sulfur therein.

4. An improved pyrometer, comprising a hermetically-sealed glass case containing-a fusible body consisting of sulfur and a dye.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

ARCHIBALT) W. DIACK.

Witnesses:

ELIZABETH M. BROWN, EDWARD N. PAGELSEN. 

